If Pontiac says to use Mobil1 synthetic then use it.
Synthetics ARE different than conventional oils, most noteably in their ability to withstand heat as compared to conventional. They are also highly detergent, keeping the engine cleaner internally and preventing the formation of sludge.
There are more expensive synthetics, Royal Purple for example.
The TV show "Horsepower" recently made a dyno run on a small block chevy (383) with conventional and synthetics. The synthetic made 8 more horsepower, just changing to it from conventional.
It does work, Walmart has had Mobil1 on sale, $10 a gallon, if memory serves. Next time they have a sale stock up. Stay away from the Walmart brand.
Wednesday, April 22nd, 2009 AT 8:21 AM